Manufacture of cores



phult.

Patented Nov; 17, 1925.

UNITED STATES PATENT OFFICE.

WILLIAM G. THOMAS, OF SOUTH ORANGE, JERSEY, ASSIGNOR TO H. HTTHOMAS, OF SUMMIT, NEW JERSEY.

MAN UFACTUBE 01003158.

No Drawing.

To all 'wlwmit may concern Be it known that I, VILLIAM G. 'IHoMAs, a citizen of the United States. and a resident of South Orange, county of Essex, New Jersey, have invented. certain new and useful Improvements in the Manufacture of Cores, of which the following is a specification.

My invention'relates to the manufacture of cores to be used in making castin s, and is based on my discoveries that cores raving very desirable qualities can be made by binding sand with a relatively small quantity of asphalt, and that 'such binding action can be accomplished by the use of emulsified as- A number of difl'erent methods of emulsifying asphalt are known, but for purposes of illustration I refer to an emulsion made by mixing a suspension of clay in water with melted asphalt under conditions which will keep the resultin roduct wet to about the consistency of thic mud.

For making cores this emulsion is diluted I with water to about the consistency of cream and then mixed with fine sand to give a moist product ada ted to be sha ed in the usual manner. A r the cores ave been Application filed October 6, 1923. Serial No. 667,083.

sand is thoroughly bound together. Cores thus formed have adequate strength for use 1n moldlnq-and have the advantage over ordlnary cores that the molten metal cokes the asphalt so that when the metal is hardened 1t is found that the core will crumble quite readlly and can be easily removed from the casting. I

It is within the spirit of my invention to use asphalt prepared in various ways, and if desired, other ingredients such as linseed 011 and graphite may be mixed in small percentages w1th the asphalt.

What I claim is: Y a a 1. core compound comprising sand, emuls fied asphalt and water.

2. A core compound comprising sand.

water and asphalt emulsified with clay.

3. In the art of making cores, the steps of mixin together sand and emulsified asphalt an bringing the mlxture to the desired consistency with water.

WILLIAM G. THOMAS. 

